-ic a-a a-b a-c a-i aaa aab aac aai aam aan aao aas ab- aba abb abc abi abm abn abo abs ac- aca acb acc aci acm acn aco acs ai- aia aib aic aii aim ain aio ais ama amb amc ami amm amn amo ams an- ana anb anc ani anm ann ano ans aoa aob aoc aoi aom aon aoo aos as- asa asb asc asi asm asn aso ass baa bab bac bai bam ban bao bas bba bbb bbc bbi bbm bbn bbo bbs bca bcb bcc bci bcm bcn bco bcs bi- bia bib bic bii bim bin bio bis bma bmb bmc bmi bmm bmn bmo bms bna bnb bnc bni bnn bno bns boa bob boc boi bom bon boo bos bsa bsb bsc bsi bsm bsn bso bss c-- caa cab cac cai cam can cao cas cba cbb cbc cbi cbm cbn cbo cbs cca ccb ccc cci ccm ccn cco ccs ci- cia cib cic cii cim cin cio cis cma cmb cmc cmi cmm cmn cmo cms cn- cna cnb cnc cni cnm cnn cno cns co- coa cob coc coi com con coo cos csa csb csc csi csm csn cso css ia- iaa iab iac iai iam ian iao ias iba ibb ibc ibi ibm ibn ibo ibs ica icb icc ici icm icn ico ics iia iib iic iii iim iin iio iis im- ima imb imc imi imm imn imo ims in- ina inb inc ini inm inn ino ins io- ioa iob ioc ioi iom ion ioo ios is- isa isb isc isi ism isn iso iss m-o maa mab mac mai mam man mao mas mba mbb mbc mbi mbm mbo mbs mc- mca mcb mcc mci mcm mcn mco mcs mi- mia mib mic mii mim min mio mis mma mmb mmc mmi mmm mmn mmo mms mna mnb mnc mni mnm mnn mno mns moa mob moc moi mom mon moo mos msa msb msc msi msm msn mso mss n-i naa nab nac nai nam nan nao nas nba nbb nbc nbi nbm nbn nbo nbs nca ncb ncc nci ncm ncn nco ncs nia nib nic nii nim nin nio nis nma nmb nmc nmi nmm nmn nmo nms nna nnb nnc nni nnm nnn nno nns no- noa nob noc noi nom non noo nos nsa nsb nsc nsi nsm nsn nso nss o-i oaa oab oac oai oam oan oao oas ob- oba obb obc obi obm obn obo obs oc- oca ocb occ oci ocm ocn oco ocs oia oib oic oii oim oin oio ois om- oma omb omc omi omm omn omo oms on- ona onb onc oni onn ono ons oo- ooa oob ooc ooi oom oon ooo oos os- osa osb osc osi osm osn oso oss saa sab sac sai sam san sao sas sba sbb sbc sbi sbm sbn sbo sbs sca scb scc sci scm scn sco scs sia sib sic sii sim sin sio sis sma smb smc smi smm smn smo sms sna snb snc sni snm snn sno sns soa sob soc soi som son soo sos ss- ssa ssb ssc ssi ssm ssn sso sss